/**
 ******************************************************************************
 * @file    stm32f4xx_crc.c
 * @author  MCD Application Team
 * @version V1.8.0
 * @date    04-November-2016
 * @brief   This file provides all the CRC firmware functions.
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; COPYRIGHT 2016 STMicroelectronics</center></h2>
 *
 * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
 * You may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *        http://www.st.com/software_license_agreement_liberty_v2
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ******************************************************************************
 */

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_crc.h"

/** @addtogroup STM32F4xx_StdPeriph_Driver
 * @{
 */

/** @defgroup CRC
 * @brief CRC driver modules
 * @{
 */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup CRC_Private_Functions
 * @{
 */

/**
 * @brief  Resets the CRC Data register (DR).
 * @param  None
 * @retval None
 */
void CRC_ResetDR(void)
{
    /* Reset CRC generator */
    CRC->CR = CRC_CR_RESET;
}

/**
 * @brief  Computes the 32-bit CRC of a given data word(32-bit).
 * @param  Data: data word(32-bit) to compute its CRC
 * @retval 32-bit CRC
 */
uint32_t CRC_CalcCRC(uint32_t Data)
{
    CRC->DR = Data;

    return (CRC->DR);
}

/**
 * @brief  Computes the 32-bit CRC of a given buffer of data word(32-bit).
 * @param  pBuffer: pointer to the buffer containing the data to be computed
 * @param  BufferLength: length of the buffer to be computed
 * @retval 32-bit CRC
 */
uint32_t CRC_CalcBlockCRC(uint32_t pBuffer[], uint32_t BufferLength)
{
    uint32_t index = 0;

    for (index = 0; index < BufferLength; index++) {
        CRC->DR = pBuffer[index];
    }
    return (CRC->DR);
}

/**
 * @brief  Returns the current CRC value.
 * @param  None
 * @retval 32-bit CRC
 */
uint32_t CRC_GetCRC(void)
{
    return (CRC->DR);
}

/**
 * @brief  Stores a 8-bit data in the Independent Data(ID) register.
 * @param  IDValue: 8-bit value to be stored in the ID register
 * @retval None
 */
void CRC_SetIDRegister(uint8_t IDValue)
{
    CRC->IDR = IDValue;
}

/**
 * @brief  Returns the 8-bit data stored in the Independent Data(ID) register
 * @param  None
 * @retval 8-bit value of the ID register
 */
uint8_t CRC_GetIDRegister(void)
{
    return (CRC->IDR);
}

/**
 * @}
 */

/**
 * @}
 */

/**
 * @}
 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
